I agree. The presented solution mitigates one of the problems, but does nothing to help you compare one of the sandwiched stacks over time. Stacked charts are

I agree. The presented solution mitigates one of the problems, but does nothing to help you compare one of the sandwiched stacks over time. Stacked charts are not very good at presenting information where there are more than two entities. Overlapping line charts do a much better job of presenting trends over time.